Preheat your oven to 350°F (175°C).
In a large bowl, combine sliced peaches, granulated sugar, lemon juice, and vanilla extract.
Transfer the peach mixture to a greased baking dish.
In another bowl, mix flour, rolled oats, brown sugar, cinnamon, and salt.
Add melted butter to the dry ingredients and stir until crumbly.
Evenly sprinkle the crumble topping over the peaches.
Bake in the preheated oven for 25-30 minutes, or until the top is golden brown.
Remove from the oven and let cool for 10 minutes.
Serve warm with vanilla ice cream or whipped cream if desired.
Enjoy your homemade peach crumble!